Apple announced today that their free education portal, iTunes U, just topped over one billion downloads for content. iTunes U provides free educational content from some of the top universities around the world and is the world’s largest online catalog of free educational content.

If you’re looking for a free education, or just want to brush up on some subjects, you can enroll in iTunes U courses from professors at Duke, Yale, Cambridge, MIT, Oxford, and Stanford.

Better late than never: Oxford and Cambridge have joined scores of prestigious universities around the world making lectures available for free on iTunes.

So far, iTunes U offerings from Oxford include J. Craig Venter on genomics and and intro series about the university narrated by noteworthy alum, ex-Monty Pythoner Michael Palin. It will expand to 150 hours.

Oxford Vice Chancellor John Hood said, “We hope that this service will make Oxford’s diverse range of audio and video material more widely accessible to applicants, alumni, supporters of the University, and the intellectually curious.”